[s-cars] Interesting state re: fuel consumption

[Robert Myers]

Another possibility might be the annual spring reformulation for 
gasoline.  The percentage of oxygenated fuel is seasonally reduced 
which, in itself, leads to better fuel mileage.

Bob

At 09:28 AM 5/10/2008, J. Khang wrote:
>"Fred Munro" <munrof at sympatico.ca> wrote:
> > Even stranger economy point on my S6. No.5 coil finally bit the big one and
> > after I replaced it, I took a 400 km road trip to Toronto. Fuel economy was
> > 8 litres/100 km going down (~30 mpg) and exactly the same coming back. I've
> > never gotten fuel economy like that on either of my S cars. It seems to be
> > holding up in my daily commute as well. Can't figure that one out - must be
> > something wrong :). Kind of nice at these fuel prices though.
> >
> > Fred Munro
> > '97 S6
>
>This is actually not surprising because the coil packs are 
>deteriorating over time and the available firing voltage is 
>dropping. I expect that the spark kernel is getting weaker and a new 
>coil pack will make a difference by reducing misfires.
>I had two coil packs fail recently and replaced all five because I 
>didn't want to mess about with them again. Like you, I have observed 
>improved fuel consumption. The engine also runs slightly smoother 
>and there is more power.
>Jonathan
>'97 S6
>
>
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